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The sweet smell you are getting is probably radiator coolant (antifreeze). This, if coming from the heater vents, most likely means that you have some sort of leak in the heater core. Either it is a loose clamp or possibly a defective heater core. Watch the coolant level carefully to avoid excessive loss and potential overheating. Be advised that simply not using the heater will not strop the leakage, as the coolant is always running through the core. It will only cause you to not get the smell since the air is bypassing the heater core.

ok --we will not say head gasket problem
what would you like us to say
we can say , have a compression test done to determine if head gasket or cracked head ---but we won't
we could say take it to an accredited radiator shop for a pressure test to find any leaks
we could say to check engine oil for signs of coolant contamination ( grey oil)
it is impossible to say exactly what is a suitable answer

Is it a bad smell or a sweet like maple syrup smell. If its sweet you got a coolant leak probably heater core. Bad smell possible causes burning something up. I would run some water in the in the air intake below your wipers just to see if it changes. Not much but a little. Better or worse in cold tempers. Hwo about when the car first start or has run awhile does the smell get better or worse. More feed back please.

Have someone start it for you in the morning while you stand behind the car. After it starts, smell the exhaust. See if it smells sweet, kind of like maple syrup. Also are you having to add antifreeze. If yes to both, you might have a head gasket starting to seep.

from he Popular Mechanics site if the smell in your car is like maple syrup:

(1) SMELLS LIKE:
MAPLE SYRUPWHEN: After the engine has warmed or possibly even after it's shut off for a few minutes.THE CULPRIT: Coolant containing sweet-smelling (but toxic)
ethylene glycol is leaking from somewhere. It could be coming from a
radiator or heater hose, a failed intake manifold gasket or cylinder
head. It might be coming from a leaky radiator cap or the radiator
itself, especially if you smell it outside the car. A strong odor inside the passenger compartment probably means a bad heater core.